How IELTS Writing Is Actually Evaluated
When preparing for IELTS Writing (both Academic and General Training), test takers often assume that longer essays or complex vocabulary automatically guarantee high band scores. In reality, every essay is graded against four equally weighted criteria defined in the official public band descriptors published by the British Council, IDP: IELTS Australia, and Cambridge University Press & Assessment:
- Task Response (Task 2) / Task Achievement (Task 1) (25%)
- Coherence and Cohesion (25%)
- Lexical Resource (25%)
- Grammatical Range and Accuracy (25%)
Understanding how these four criteria interact is the single most effective way to improve your score. Below is a breakdown of each criterion, followed by an annotated original student paragraph demonstrating how revisions move writing from an estimated Band 6 to Band 7.5.
1. Task Response (TR) / Task Achievement (TA)
- Task Response (Task 2) evaluates whether you addressed all parts of the prompt, maintained a clear and consistent position throughout the response, and extended and supported your main ideas with logical explanations rather than superficial generalizations.
- Task Achievement (Task 1) assesses whether you presented a clear overview of main trends, differences, or stages, selected appropriate key features, and reported accurate data without including personal opinions.
Common Pitfall: Providing a list of three or four different ideas in one paragraph without developing any of them. A Band 7 essay presents fewer ideas but develops each one with reasons and consequences.
2. Coherence and Cohesion (CC)
Coherence refers to the overall flow and logic of your arguments, while cohesion refers to the linguistic devices (pronouns, referencing, discourse markers) used to connect sentences and paragraphs.
- Band 6 typical trait: Mechanical use of linking devices (e.g., starting every sentence with Moreover, Furthermore, In addition, On the other hand).
- Band 7+ typical trait: Smooth progression of ideas where paragraphing is logical, with a clear central topic in each paragraph, and cohesive devices are used naturally without drawing undue attention.
3. Lexical Resource (LR)
Lexical Resource measures the range and precision of vocabulary, as well as the accuracy of collocations and word formation.
- Examiner Reality: Memorizing rare, obscure words and inserting them unnaturally ("plethora", "myriad", "in a nutshell") often backfires by creating collocation errors and unnatural register.
- What scores high: Topic-specific precision. For example, instead of "bad things happen to cities", writing "uncontrolled urbanization places strain on municipal infrastructure".
4. Grammatical Range and Accuracy (GRA)
This criterion measures both the variety of grammatical structures you attempt (compound sentences, complex clauses, conditional structures, passive voice) and the proportion of error-free sentences.
- Key Rule: You do not need 100% error-free writing for Band 7, but frequent basic errors in subject-verb agreement, articles (a/an/the), or punctuation will cap your GRA at Band 6.
Annotated Original Example: From Draft to Revision
Prompt:
Some people believe that university students should focus only on subjects related to their future career. Others argue that they should study a broad range of subjects. Discuss both views and give your opinion.
Student Draft (Estimated Band 6.0):
"On the one hand, studying only career subjects is beneficial. It saves a lot of time. Students can get a high-paying job easily because they know technical skills. Furthermore, nowadays the job market is very competitive and companies want specialists. If they study useless subjects like history or art, they will waste money and energy."
Criterion Analysis of the Draft:
- Task Response: The point is relevant, but the claim that history is "useless" is subjective and unsupported.
- Coherence & Cohesion: Staccato rhythm. Four consecutive short sentences with mechanical linkers (Furthermore).
- Lexical Resource: Basic vocabulary ("saves a lot of time", "get a high-paying job", "waste money").
- Grammar: Simple clause structures; limited range.
Revision (Estimated Band 7.5):
"Advocates of specialized curricula argue that focusing exclusively on vocational and industry-relevant disciplines maximizes career readiness. In increasingly competitive labor markets, employers prioritize graduates who possess demonstrable technical competencies over generalists. Consequently, dedicating degree coursework directly to practical field requirements allows students to transition more seamlessly into professional roles without expending tuition fees on unrelated peripheral subjects."
Why the Revision Scores Higher:
- Clear Progression: Ideas flow logically from specialization to employer demands to professional transition.
- Precise Collocations: "vocational and industry-relevant disciplines", "demonstrable technical competencies", "transition seamlessly".
- Complex Sentence Variety: Uses introductory participial phrases and complex adverbial clauses naturally.
Put It Into Practice
You can test your own writing against these four criteria on our Free IELTS Writing Checker without creating an account. You will receive an immediate estimated band breakdown across Task Response, Coherence, Lexical Resource, and Grammar with specific sentences to revise.
How the Four Criteria Interact in One Paragraph
The criteria are scored separately, but the same writing decision can influence more than one score. Consider a body paragraph that begins with a clear claim, explains the mechanism behind it, gives one relevant example, and links the example back to the question. The clear claim supports Task Response because it advances the position. The logical explanation supports Coherence. Precise topic vocabulary supports Lexical Resource. The mix of simple and complex sentences provides evidence for Grammatical Range and Accuracy.
This does not mean one sophisticated sentence automatically raises four scores. It means good writing is integrated. When candidates chase vocabulary separately from meaning, their writing often becomes less accurate. When they add linking words without improving logic, cohesion becomes mechanical. Start with meaning, then make the language precise.
A Four-Pass Review Method
Use a different question on each pass through your draft:
- Task pass: Underline the exact words that answer each part of the prompt. If one instruction has no matching sentence, fix coverage before editing vocabulary.
- Logic pass: Write a two- or three-word label beside every paragraph. If two paragraphs have the same label, they may repeat each other. If a paragraph needs three labels, it may lack a single focus.
- Vocabulary pass: Circle repeated general words such as important, good, bad, thing, and problem. Replace only the repetitions for which a more precise word is natural.
- Grammar pass: Mark the subject and main verb in each long sentence. Check agreement, sentence boundaries, articles, and punctuation before attempting stylistic upgrades.
Diagnose the Limiting Criterion
Do not try to improve everything at once. If the position is unclear or an instruction is missing, Task Response is the immediate priority. If readers must reread to understand how sentences connect, work on Coherence. If the ideas are clear but vocabulary is repetitive or inaccurate, target Lexical Resource. If frequent errors interrupt meaning, prioritise sentence control.
A useful weekly goal is one observable behaviour, such as “every body paragraph will contain a claim, explanation, and specific example.” This is easier to practise and measure than “reach Band 7.”
Why One Score Can Move While Another Does Not
Criteria develop at different speeds. A candidate may improve Task Response by answering every instruction clearly while grammatical accuracy remains unchanged. Another may remove frequent sentence errors but still present underdeveloped ideas. Treat the four scores as a profile, not a verdict about overall English ability.
Compare at least three timed responses before deciding that a criterion has genuinely improved. Use different topics but the same review checklist. A single strong or weak task can be influenced by topic familiarity; a repeated behaviour across several tasks is a better learning signal.
Turn This Guide into Deliberate Practice
Reading creates familiarity; retrieval and revision create usable skill. After finishing this guide, close the page and write the three rules you remember most. Reopen it, correct anything you missed, and choose one rule to apply in a short exercise today.
A Practical 20-Minute Study Block
- Three minutes — retrieve: Write the key rule in your own words without looking back.
- Five minutes — notice: Find the issue in a previous essay or in a model answer. Mark the exact sentence where the rule matters.
- Eight minutes — produce: Rewrite one paragraph or plan one response while applying the rule.
- Four minutes — check: Compare your work with the prompt and the relevant public criterion. Record one successful choice and one remaining problem.
Keep an error log with four columns: date, exact example, corrected version, and rule. Record patterns rather than every minor slip. If article use appears in five drafts, it deserves focused grammar practice. If conclusions repeatedly introduce new arguments, your planning routine needs attention. Review the log weekly and select no more than two priorities.
Review the Reason, Not Only the Correction
For every changed sentence, explain why the new version is better. A useful explanation might be “the example now proves the topic sentence,” “the pronoun has a clear reference,” or “the verb agrees with the plural subject.” Avoid explanations such as “it sounds more advanced.” If you cannot explain the change, you are unlikely to reproduce it under exam conditions.
At the end of the week, choose one old paragraph and rewrite it without looking at the corrected version. Then compare the two. Keep improvements that preserve your meaning and remove edits that merely make the language longer. This delayed rewrite tests whether the lesson has become part of your own writing process.
When a rule still feels uncertain, find two accurate examples in a trusted grammar reference or official preparation material. Create one new sentence that follows the same pattern. Small, verified examples are safer than memorising large lists of “high-band” phrases with no context.
What Progress Looks Like
Progress is not a perfectly rising sequence of estimated bands. Topics vary, and individual tasks expose different weaknesses. Look for behaviours you can observe across several responses: clearer positions, complete prompt coverage, more focused paragraphs, fewer repeated errors, more accurate comparisons, or faster planning under timed conditions.
Use the writing evaluator after drafting independently. Read the cited evidence before the score, revise the response in your own words, and keep both versions. For the official test format, current policies, and authorised preparation materials, always confirm details with the official IELTS organisations.